Publisher Filters in VS .NET

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Publisher Filters
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A publisher filter is completely different from a parameter filter Figure 11-14 shows the call flow with a publisher filter The publisher filter is invoked from the event class when an event occurs and has the responsibility to forward the events In contrast to subscriber filters, just one publisher filter deals with all subscribers The publisher filter decides when and how the events should be forwarded to the subscribers, which is possible because the publisher filter gets a subscriber collection so that the filter can control event forwarding
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Figure 11-14 Publisher filter
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A publisher filter is a component that implements the COM interface IMulti-InterfacePublisherFilter with the methods Initialize and PrepareToFire The method Initialize associates an event class with the publisher filter When this method is called, the publisher filter receives a reference to the interface IMultiInterfaceEventControl that can be used to get the list of registered subscribers This reference should be remembered in the publisher filter so that an actual subscriber list can be accessed when needed The method PrepareToFire is called immediately when the event class fires an event The event class passes the event interface and the method that is fired, in addition to a reference to the interface IFiringControl With the IFiringControl interface, you can fire the event to the subscriber that should receive the event IFiringControl has just a single method, FireSubscription, that requires an IEventSubscription passed You can get references to the IEventSubscription interface from the list of subscribers Here you can decide what subscriber should get the event, and the order of firing the events
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With NET, there is no support to implement a publisher filter If you want to create a publisher filter with C#, you must redefine all the required COM interfaces However, you do have another option: You can create a publisher filter using C++ Such a publisher filter works great in cooperation with an event class defined in C#
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Using LCEs Across the Network
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The easy scenario using LCEs is on a single system, where the event class and the subscriber must reside on a single system If you want to use LCEs distributed across multiple systems, you have a couple of options, as follows: LCE routing Event class proxies
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LCE Routing
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With the configuration of a persistent subscriber, you can define a server name with the subscription options, as shown in Figure 11-15 Do not be confused by the term server name used here; you specify the computer name of the subscriber system (which acts as a server when the event is distributed, but is a client in another role)
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Figure 11-15 Configuring a server name with the subscription
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When a subscriber is instantiated, the event service looks for the server name in the subscription configuration If a server name is defined, the event is forwarded to the subscriber on the configured system The subscriber must be installed on both the routing and the target system Using COM+ routing, you can add multiple routes to different systems so that the event can be easily distributed in the network Figure 11-16 shows an LCE routing configuration in a distributed solution The publisher fires events to the event class In this scenario, three subscriptions are configured One subscriber is on the same system as the publisher, whereas two subscribers have other routes configured One route references the system Enterprise (see Figure 11-15), whereas another subscription is configured to reference the system Andromeda The subscriber router forwards events to these subscribers
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